UG345: Si72xx Eval Kit User's Guide
The Si72xx-Eval-Kit is a simple and low cost demonstration of the six basic types of
Si72xx Hall effect magnetic position sensors. A USB adapter provides power to the
sensor boards and reads the output of the sensors. The data from the sensors is dis-
played on a PC GUI and can also be logged to a file. For the case of the Si7210 I2C
sensor, the PC GUI also allows configuration of the sensor by I2C.
The six sensor types are supplied on small, postage-stamp-sized (PS) boards that con-
nect to the USB dongle by a 6-pin flat cable.
The Si72xx-Eval-Kit includes:
• (1) USB adapter “SensorUSBDongle” that allows reading of the sensor data and I2C
communications
• (1) Si7201-B01V-EB Switch PS board
• (1) Si7202-B01V-EB Latch PS board
• (1) Si7210-B00V-EB I2C PS board
• (1) Si7211-B00V-EB Analog PS board
• (1) Si7212-B00V-EB PWM PS board
• (1) Si7213-B00V-EB SENT PS Board
• (1) 8-inch, 6-pin cable
• (2) magnets
KEY POINTS
• Low cost evaluation of the 6 sensor types
in the Si72xx family
• Switch, Latch, PWM, Analog, SENT,
and I2C
• USB adapter provides power and can read
the data from the sensor
• PC GUI displays the data which can also
be logged to a file
• I2C sensor configuration capability
Connection of the USB Adapter and Postage Stamp Board
silabs.com
| Building a more connected world.
Rev. 0.1
UG345: Si72xx Eval Kit User's Guide
Download the GUI
1. Download the GUI
The GUI is available through Simplicity studio or from the web page:
http://www.silabs.com/start-sensors.
When installing from Simplicity Studio, plug in the USB adapter first. Simplicity Studio will recognize the USB adapter and automatically
offer the choice of downloading the GUI.
The GUI is distributed as an installer package which will install the PC GUI. With the USB adapter and desired PS evaluation board
connected as shown in the figure on the front page, launch the GUI.
silabs.com
| Building a more connected world.
Rev. 0.1 | 2
UG345: Si72xx Eval Kit User's Guide
GUI Operation
2. GUI Operation
If an I2C part is detected when the GUI is launched, the GUI will be automatically configured. For other part types that simply output the
data, the part type for the PS board must be manually entered (device type selector and device scale selector boxes in upper left corner
of the GUI).
The scale for all of the PS boards is 20mT. Once the “start” button is clicked the GUI will automatically read the data from the sensor in
analog, PWM, or SENT format or simply the display the output pin status for switch and latch type parts.
Figure 2.1. GUI Display of the Output of an Si7211 Analog Output Sensor
Figure 2.2. GUI Display of the Output of a Si7210-B00 I2C Sensor
The figure above shows the magnetic field and output pin status of the Si7210-B00 I2C Sensor. Note the tamper feature is enabled so
the output pin goes back to the zero field level at high field. The data can optionally be logged to a file in standard csv format. The
temperature of the Si7210 can also be read when the logging of magnetic field data is stopped.
silabs.com
| Building a more connected world.
Rev. 0.1 | 3
UG345: Si72xx Eval Kit User's Guide
Si7210 I2C Configuration
3. Si7210 I2C Configuration
If the Si7210-B00-EB PS board is connected and an I2C device type is selected, then the I2C part can be further configured by clicking
on the options menu and Si7210 configuration button. This will bring up a new window that allows configuration of the Si7210 type sen-
sors.
Figure 3.1. Sensors Configuration GUI
The GUI is a graphical representation of the Si7210 register map.
silabs.com
| Building a more connected world.
Rev. 0.1 | 4
UG345: Si72xx Eval Kit User's Guide
Si7210 I2C Configuration
Several options are available from the configuration GUI:
1. Configure the device operate and release point with sleep timer settings.
In sleep timer operation, only the fields corresponding to registers 0xC6 and 0xC7 can be configured:
• Switch or latch
• Output pin polarity (high or low for high field)
• Symmetry
• Omnipolar (responds to the field magnitude)
• Unipolar (responds to positive or negative field)
• Switch point
• Hysteresis
After these fields have been configured and loaded, and when the configuration window is closed, the data graph can be restarted
and will only show the output pin status as the magnetic field data is not available by I2C in sleep timer operation. To wake the
device out of sleep mode and try a different configuration, click options and Si7210 configuration again.
2. Configure the idle mode parameters.
In idle mode, all of the registers are configurable. This adds the capability of programming:
• Tamper threshold ( the output pin will return to the zero field value once the tamper threshold is crossed)
silabs.com
| Building a more connected world.
Rev. 0.1 | 5
京公网安备 11010802033920号
EEWORLD
